Point telescope at target. Set your camera to infinity focus (knocked back just a touch). Shoot. I didn't realise there was a term for it until I saw this thread though.
Ideally you need a camera which allow fully manual operation - so you can set aperture, time, and focal point. If you're aiming at planets (or nebulae) then shoot wide-open, if you're taking shots of the moon shoot almost completely closed, and I guess do what the light dictates for telephotography. Remember to account for the aperture of the telescope as well!
